SunSpec based inverter for module level shutdown

Fronius' Symo Advanced Inverter offers an integrated Power Line Communication (PLC) transmitter based on the recently published SunSpec Communication Signal for Rapid Shutdown. This industry standard is a multi-vendor and multi-device communication specification for inverters, modules, and string combiners to support NEC 2014, NEC 2017, and UL 1741 module-level rapid shutdown requirements. 

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